This article presents an innovative system for the evaluation of teaching performance. Assessment forms, developed in a research project, give a 3-dimensional view of a teacher's performance as seen by: (1) the supervisor, (2) the teacher him/herself, and (3) the students of the teacher. A review of the literature which served as background to this study is presented. Copies of the forms themselves are then provided. The originality of this system lies in the following: (1) It is the only existing 3-dimensional system to evaluate teaching performance. (2) The forms are easy to use, since unlike many previous observational systems, they require no special training for their implementation. (3) It contains a student-reaction questionnaire, rarely found in observational systems, that is specifically geared toward foreign language teaching and that can be used both at the secondary and university levels. (4) It evaluates verbal and nonverbal behavior, and provides a means of assessing teaching performance both objectively and subjectively. (Author)